Pump operating mechanism



April 10, 1934.

H. A. PALMER 1,954,712

PUMP OPERATING MECHANISM 2 Sheets-Sheet 1 Filed Oct. 21. 1950 ATTORNEY.

April 10, 1934. H. PALMER 1,954,712

PUMP OPERATING MECHANI SM Filed Oct. 21, 1930 2 Sheets-Sheet 2 l N VEN TOR.

lhrr/A 741mm A TTORNEY.

Patented Apr. 10, 1934 1,954,712 PUMP OPERATING MECHANISM Harry A. Palmer, Boston,

Palmer Inventions, Inc.,

Mass, assignor to Boston, Mass.

Application October 21, 1930, Serial No. 490,286 4 Claims. (01. 123-439) This invention relates to an operating mechanismfor the piston rods of fuel pumps of the reciprocatory type, and has for its primary object r provide, in a manner as hereinafter set forth, a a mechanism of such class particularly designed for operating a pump or pumps used in connection with internal combustion engines for supplying fuel thereto. A further object of the invention is to provide a mechanism of the character aforesaid which includes means for regulating the length and 00 currence of the strokes of the pump or pumps with which it is associated.

With the foregoing and other objects in view,

the invention consists of the novel construction,

combination, and arrangement of parts as hereinafter more particularly described, and as illustrated in the accompanying drawings wherein are shown embodiments of the invention, but it is to be understood that the description and drawings are to be taken as illustrative and that the invention is intended to be limited only by the scope of the claims hereunto appended.

In theaccompanying drawings wherein like refrence characters are employed to designate like parts throughout the several views:-

Figure 1 is an elevation of a mechanism in ac cordance with this invention.

Figure 2 is a section taken on the line 2-2 of Figure 1. H t

By way of example an embodiment of the mechanism is shown in Figures 1 and 2which is adapted to operate four pumps. The numeral 1 indicates the pump cylinders which are provided with spring controlled piston rods 2. The mechanism includes a support 3 which is provided centrally thereof with a yoke 4, and which is further provided adjacent its ends with uprights 5, each of which supports a pair of guides 6 for a substantially annular plate 7. At diametrically opposite points, the plate 7 is provided with outwardly projecting bosses 8, each of which is formed on opposite sides thereof with recesses 9 for the reception therein of a pair of the guides 6.

4 Projecting from the outer faces of the bosses 8 are a pair of pins 10 which project through elongated slots 11 in a shifting element 12 which is substantially in the form of an annulus. The element 12 is provided with an outwardly projecting lug 13 which is pivotally connected to the yoke 4. At a point diametrically opposite the lug 13, the element 12 is provided with an operating lever 14 which hereinafter will be termed a timing lever. The plate 7 is slidably and non-rotatably 5'5 mounted on a hollow drive shaft 15 which extends therethrough and through the element 12, and which may be driven by any suitable source of power, not shown.

Pivotally connected to a side face of the plate 7 are a plurality of rocker arms 16, each of which 00 is provided adjacent its free end with a pair of depending legs 17 between which is a bevelled roller 18 rotatably mounted on a shaft 19. The outer ends of the piston rods 2 permanently bear against the upper faces of the arms 16 to maintain the shaft 19 in engagement with a cam element 20 rotatably mounted on a flange 21 formed on the plate 7. The body of the cam element 20 is of varying width to provide equi-spaced, outwardly projecting peripheral portions or lobes 22. 7D The element 20 is provided with a handle member 23which hereinafter will be termed a throttle lever. "A retaining member 22' for element 20 is secured to flange 21;

Fixedly mounted on the shaft 15 is a cam 24 which is in the form of an annulus 25 provided with a plurality of lobes 26 disposed helically with respect to the outer face of the annulus 25. The position of the lobes 26 are clearly shown in Figure 1. The lobes 26 are spaced equi-distant from each other, that is to say diametrically opposed. The rollers traverse the lobes 26.

To provide for full contact of the rollers 18 with the helically disposed lobes 26 the rollers 18 are of bevelled form, so that the outer edges of the rollers 18, when traversing the lobes 26 will conform to the diagonal disposition of the latter.

In the operation of the mechanism the cam 24 is rotated with the shaft 15 and upon contact of the lobes 26 with the rollers 18, the piston rods 2 are moved outwardly to operate the pumps. The length of stroke of the piston rods is governed by the throttle lever 23. When it is moved in manner to position the projections or lobes 22 on the cam element 20 in direct alignment with the shafts 19 the piston rods will have a short stroke. When it is desired to lengthen the stroke of the piston rods, the throttle lever 23 is moved in a manner to shift the projections or lobes 22 out of alignment with the shafts 19. The occurrence of the stroke of the piston rods is governed by the timing lever 14 and by means of the latter the shifting element 12, plate 7, arms 16 and rollers 18 may be moved longitudinally of the shaft 15 and relative the lobes 26.

The timing lever is intended to govern the occurrence and not the length of the stroke of the piston. The actuation of the timing lever 14 to advance or retard the occurrence of the piston stroke causes pins 10 to move longitudinally of the bodily moving the slots 11 in order that plate 7, arms 16 and roller 18 may be moved relative to the length of the lobes 26 of cam 24 longitudinally of the shaft 15. This movement does not change the length of the stroke of the piston, but it does cause the rollers 18 to come in contact with lobes 26 at a different instant in the rotation of cam 24. By this arrangement each roller 18 will bear completely on a portion of a lobe 26 during the period of contact.

What I claim is:

1. In a mechanism for operating fuel pumps of that type employing a spring controlled piston rod, the combination of a drive shaft, a cam fixedly mounted on said shaft and having a radially extending, diagonally disposed lobe, a plate slidably mounted on the shaft rearwardly of the cam, an arm having one end permanently pivotally supported upon one face of the plate and its other end supporting the piston rod, a roller for traversing the lobe, a cam element shiftably mounted upon said plate, a shaft for said roller, said shaft carried by the non-pivoted end of said arm and mounted on the edge of said cam element, and means for shifting said cam element for roller to varying extents into the path of travel of the lobe to vary the extent of movement of the roller imparted to the latter by the lobe.

2. In a mechanism for operating fuel pumps of that type employing a spring controlled piston rod, the combination of a drive shaft, a cam fixedly mounted on said shaft and having radially extending, diametrically opposed, helically disposed lobes, a plate slidably mounted on the shaft g rearwardly of the cam, an arm having one end pivotally supported upon one face of the plate and its other end permanently supporting the piston rod, a roller for traversing said lobes, a cam element mounted on the plate and shiftable relative thereto, a shaft for said roller, said shaft carried by the non-pivoted end of said arm and mounted on the edge of said cam element, means for bodily moving the roller to varying extents into the path of travel of the lobes to vary the extent of movement of the roller imparted to the latter by the lobes, and means for shifting said plate longitudinally of the drive shaft to bodily move the roller in lengthwise relation with respect to the lobes to provide for the roller contacting the lobes at selective periods in the'cycle of rotation of the shaft to vary the timing of the stroke of the piston rod.

3. In a mechanism for operating fuel pumps of that type employing spring controlled piston rods, the combination of a drive shaft, a cam fixedly mounted on said shaft and formed with a pair of radially extending, diametrically opposed, helically disposed lobes, a plate slidably mounted on the shaft rearwardly of said cam, a series of equidistant spaced arms, each pivoted at one end to one face of said plate and having its other end permanently bearing against the end of a piston rod, a series of rollers corresponding in number to the number of said arms, a cam element rotatably mounted on said plate and provided with a series of lobes corresponding in number to the number of said arms, a shaft for each roller disposed parallel to the drive shaft, each roller shaft carried by the non-pivoted end of an arm and mounted "upon the edge of said cam element, means for rotating said cam element for bodily moving the roller to varying extents into the path of travel of the lobes to vary the extent of the movement of the roller imparted to the latter by the lobes, and means for shifting the plate and cam element toward the cam to bodily move the roller in lengthwise relation with respect to the lobes to vary the timing of the stroke of the piston rods.

4. In a mechanism for operating fuel pumps of that type including spring controlled piston rods, the combination of a drive shaft, a cam fixed thereto and bodily moving therewith, said cam including a helically disposed lobe, an upstanding support positioned rearwardly of the cam and slidably mounted on the shaft, a cam element mounted on the support and bodily shiftable therewith, a rocker arm pivotally connected at one end to the front of the support and having its other end adapted to, bear against the outer end of the piston rod of the pump, a roller arranged in the path of said lobe, means for coupling the roller to the said other end of the arm, said means being slidably mounted on said cam element, means for shifting said cam element about said support for bodily moving the roller to varying extents into the path of travel of the lobe to vary the extent of movement of the roller imparted to the latter y Said lobe, and means for shifting the support and cam element lengthwise of the shaft to bodily move the roller in lengthwise relation with respect to the lobe to provide for the roller contacting the lobe at selective periods in the cycle of rotation of the shaft to vary the timing of the stroke of the piston rod.

HARRY A. PALMER. 

